In vivo coincidence detection in mammalian sound localization generates phase delays.

In vivo coincidence detection in mammalian sound localization generates phase delays.
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DOI:
10.1038/nn.3948
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发表时间:
2015-03
影响因子:
25
通讯作者:
Joris, Philip X.
Joris, Philip X.
中科院分区:
医学1区
文献类型:
--
作者:
Franken, Tom P.;Roberts, Michael T.;Wei, Liting;Golding, Nace L.;Joris, Philip X.

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声音定位关键取决于检测声音到达两只耳朵的时间差异(声学延迟)。基本的机制还在争论中,但所有的提议都包括一个符合检测过程和一个独立的内部延迟来源,它抵消了声音延迟并决定了神经调谐。我们获得了蒙古沙土鼠双耳神经元的活体膜片钳记录,结合药物操作,直接比较神经元的输入和输出,并分离兴奋和抑制。这一结果不能用现有的模型来解释,并揭示了符合检测不是一个瞬时过程,而是由内在电导与先前突触活动的相互作用形成的。这种相互作用产生内部延迟,作为符合检测过程的固有部分。因此,被认为可以在许多大脑区域提取同步活动的乘法和时移阶段可以组合在一个操作中。
Sound localization critically depends on detection of differences in arrival time of sounds at the two ears (acoustic delay). The fundamental mechanisms are debated, but all proposals include a process of coincidence detection and a separate source of internal delay which offsets the acoustic delay and determines neural tuning. We obtained in vivo patch clamp recordings of binaural neurons in the Mongolian gerbil, combined with pharmacological manipulations, to directly compare neuronal input to output and to separate excitation from inhibition. The results cannot be accounted for by existing models and reveal that coincidence detection is not an instantaneous process but is shaped by the interaction of intrinsic conductances with preceding synaptic activity. This interaction generates an internal delay as an intrinsic part of the process of coincidence detection. The multiplication and time-shifting stages thought to extract synchronous activity in many brain areas can thus be combined in a single operation.
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